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What does blockchain change about intermediaries?
A blockchain is a shared ledger: a record of transactions maintained by a network under agreed rules. Instead of relying on one organization to keep the sole authoritative copy, participants can consult a common record and use the network’s validation process to agree on what is added. That can reduce the need for a central party whose job is to maintain or reconcile that record.
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Smart contracts are programs deployed on a blockchain. When specified conditions are met, they can carry out actions such as transferring a digital asset or applying a lending or trading rule. This can automate steps that would otherwise require an intermediary to process or enforce them, provided the conditions can be expressed in software.
The key distinction is between removing a particular intermediary and eliminating intermediation altogether. Someone still designs and updates the protocol, validates transactions, provides data, operates user-facing services, or resolves problems. Those responsibilities may be distributed, reassigned, or concentrated in new organizations.
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When is blockchain a plausible alternative?
The strongest case is when multiple independent participants need to maintain a durable shared record, have limited trust in one another, and can agree on common rules. In that situation, a distributed ledger may reduce duplicate recordkeeping or reconciliation. If a small, trusted group can meet its needs with a conventional database or even a spreadsheet, adding a blockchain may create complexity without a corresponding benefit.
Any comparison should look beyond whether a system is called “decentralized.” Consider who controls validation and upgrades, how quickly and cheaply transactions settle, how the system connects to other systems, who can see the data, how errors are corrected, and who is accountable when something goes wrong. Whether a proposal has sustained use beyond a pilot also matters.
Which intermediary functions could change?
| Area | Potential change | What still has to work |
|---|---|---|
| Payments and financial settlement | A shared ledger and tokenized assets could reduce some processing or reconciliation steps and support shorter settlement windows. | The system still needs resilience, clear governance, settlement finality, scalability, and accountable operators. |
| Decentralized finance (DeFi) | Smart-contract services can enable lending, borrowing, and trading without following the same path through traditional financial institutions. | Users still face technical, market, and execution risks, as well as network fees and the possibility of new intermediaries. |
| Supply-chain records | Participants may use a shared record of custody or transactions rather than repeatedly reconciling separate databases. | The ledger cannot establish that an item was correctly identified or that information entered about it was true. |
| Land-title and other records | A ledger could record transfers or documents if the relevant institutions agree on governance, data, and legal recognition. | There must be a process for correcting errors and establishing the record’s legal effect; a possible use is not proof that public registries have been broadly replaced. |
The Bank of England’s DLT Innovation Challenge 2025: Final Report says that, in financial markets, distributed ledger technology “could facilitate faster, cheaper processes – with fewer intermediaries, shorter settlement windows and smart contracts automating routine processes.” The report describes potential, not a guaranteed result across financial systems. Its discussion also emphasizes that regulated infrastructure must meet demanding operational and governance requirements.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsFor non-financial applications, evidence of broad replacement is limited. The U.S. Government Accountability Office’s 2022 technology assessment, Blockchain: Emerging Technology Offers Benefits for Some Applications but Faces Challenges (GAO-22-104625), found that blockchain could help in some applications but be limited or problematic in others; many non-financial efforts it reviewed, including supply-chain uses, were still at pilot stage. That finding describes the efforts reviewed in 2022, not every later project.
Why can new middlemen appear on a blockchain?
Networks need ways to decide which transactions are valid, determine their order, produce blocks, and apply protocol rules. Specialized participants can take on those tasks. In decentralized finance on Ethereum, for example, the New York Fed describes a chain of roles involving arbitrageurs, block builders, block proposers, and staking pools or exchanges. Transaction privacy and risk-sharing help create these roles; permissionless access alone does not ensure that a market stays dispersed.
Two figures from the Federal Reserve Bank of New York’s August 2024 analysis show how concentrated some of these roles were in the Ethereum setting it examined:
- Three of 167 known block builders captured more than half of builder revenue and proposed blocks.
- The top five staking pools or exchanges, among more than 150,000 proposers, accounted for more than 50 percent of proposer revenue and blocks added to the chain.
A revised 2025 New York Fed study by Pablo Azar, Adrian Casillas, and Maryam Farboodi estimated that, in its Ethereum setting, a 1 percent increase in the value of private information causally increased an intermediary’s profit share by 0.57 percent. This is a study-specific estimate, not a rule that can be applied to every blockchain. The authors concluded: “Our results provide causal evidence that information can be a fundamental source of endogenous centralization in the market structure, demonstrating how natural oligopolies can emerge even in purportedly decentralized economies.”
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These findings do not establish that every blockchain market is concentrated, or that the same pattern applies across industries. They do show why a network’s permissionless design is not enough to prove that power or intermediary work has been evenly distributed.
What can a blockchain not solve by itself?
It cannot verify every real-world fact
A ledger can preserve a record, but it cannot independently confirm that a physical product is authentic, that a shipment is in the stated condition, or that an event occurred as reported. Bringing outside information onto a blockchain requires data providers, devices, or agreed procedures that users have reason to trust. If the source is wrong, the ledger can preserve the wrong information.
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It cannot remove legal or governance decisions
Software can execute a coded rule, but it cannot settle every dispute about what a contract meant or whether an outcome is lawful. Networks also need decisions about upgrades, responsibility, and how to respond to errors or failures. In regulated financial systems, accountable governance and settlement finality remain necessary requirements.
It does not guarantee security, privacy, speed, or low cost
Tamper resistance does not prevent flaws in smart-contract code, compromised wallets, attacks on endpoints, or failures in connected services. Public records can raise privacy concerns, while networks may face throughput and timing limits. Complex transactions can require more steps and higher fees than simple transfers.
It may add dependencies between networks
Blockchains often cannot communicate directly. Bridges, oracles, and middleware can connect systems, but each adds components that may fail or be attacked. Interoperability is therefore not a free consequence of using a shared ledger.
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It does not remove consumer and financial risks
Users may face crypto-asset volatility, technical complexity, uncertain protections, unclear rules, illicit activity, and privacy or security problems. Energy use is another concern identified by the GAO. The OECD’s 2024 assessment of DeFi in ASEAN economies found that participation had been substantially driven by speculation and fear of missing out, rather than practical financial-inclusion use cases. That regional finding should not be generalized to all DeFi users or markets.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Has blockchain already replaced traditional intermediaries?
The evidence does not support a blanket claim that blockchain has already replaced banks, brokers, insurers, governments, lawyers, logistics firms, or public registries. The GAO’s 2022 review found many non-financial applications at the pilot stage. The Bank of England’s 2025 challenge examined potential wholesale-payment and settlement designs alongside unresolved infrastructure requirements. The OECD has also described regulated or compliant digital-finance and tokenized-asset pilots exploring potential efficiencies, such as atomic settlement or reduced post-trade and clearing intermediation. These are avenues under exploration, not proof of a settled outcome for consumers or the wider economy.
The useful question is not whether blockchain will abolish “middlemen,” but which specific task might be handled differently, who would take responsibility for the replacement, and whether the new arrangement works better in practice. A ledger may reduce one party’s role while leaving other forms of intermediation—and the need for reliable rules, data, and accountability—intact.
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